/Engine/Source/Runtime/Engine/Public/Animation/AttributesRuntime.h
static [TArray](API\Runtime\Core\Containers\TArray)< [FAttributeId](API\Runtime\Engine\Animation\FAttributeId) > & GetKeys ( [TAttributeContainer](API\Runtime\Engine\Animation\TAttributeContainer)< BoneIndexType, InAllocator > & Attributes, int32 TypeIndex )